Malicious PDF — malware analysis report

Static analysis result for SHA-256 e926f386187d20f0…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 23:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 393308d977e33bcee5952907a4cdd72d SHA-1: dc45c1441aecaf0e59349eeb063b5e390423c254 SHA-256: e926f386187d20f00db475bba3db830e8931195e16cfe19c369796c9b067f724
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URIs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=what+simple+machine+is+a+screwdriver PDF link annotation
    • http://lovepetclinics.com/file_media/file_image/file/jatiwupemogeve.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/dawakemefewaxofizibeni.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/98021714828.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/72738123799.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/wimamerasajapopubilema.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6383f23b5---galosijowipa.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/wudukakapi.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163155012533.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8788227e7---56235999363.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/8128968325.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/lebufirujazefawuwabun.pdfIn PDF document text
    • http://tzsunup.com/upload/38119937871.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/lovibonafolen.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/25937307644.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/kojag.pdfIn PDF document text
    • http://linker-apps.com/files/41714363680.pdfIn PDF document text
    • http://rjt1.org/upload/files/27059693963.pdfIn PDF document text
    • http://renknh.com/ckupload/files/5136032612.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/52621146571.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/58781213334.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/kudolarapubudelexezizoniw.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/47668473431.pdfIn PDF document text
    • http://quranday.org/userfiles/file/24875963589.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 16264 bytes
SHA-256: 0612875d03e6224484a52f1def132627954905a912901133f385b45b03ff4cce
font_02_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 10804 bytes
SHA-256: fb95e4374b7d2854f9aaec17e716a17689336669dd4d1a256145f7e9acb9f62a

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